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20.64% Efficient and Stable Binary Organic Solar Cells via Thermodynamic-Engineered Interlayer Diffusion and Exciton
Kangbo Sun1, Yufei Wang1, Guangye Zhang1
1College of New Materials and New Energies, Shenzhen Technology University, Shenzhen, 518118, China.
Advanced Materials (Deerfield Beach, Fla.)
|August 30, 2025
Summary
Hot-substrate processing enhances organic solar cell performance by controlling active-layer assembly dynamics. This method improves efficiency and operational stability, paving the way for advanced organic photovoltaic devices.
Area of Science:
- Organic electronics
- Materials science
- Photovoltaics
Background:
- Thermodynamics is crucial for organic solar cell active-layer optimization, but temperature-dependent mechanisms limit efficiency.
- Understanding these mechanisms is key to advancing organic solar cell technology.
Purpose of the Study:
- To investigate temperature-controlled assembly dynamics during sequential processing (SqP) of organic solar cell active layers using real-time thermal imaging.
- To elucidate how hot-substrate (HS) processing influences active-layer morphology and performance compared to traditional hot-solution techniques.
Main Methods:
- Real-time thermal imaging to monitor active-layer assembly dynamics during sequential processing (SqP).
- Hot-substrate (HS) processing technique with higher temperature and prolonged heating compared to hot-solution methods.
- Fabrication and characterization of organic solar cell devices with varying active-layer thicknesses and hole transport layers.
Main Results:
- HS processing accelerates liquid-phase reorganization and nucleation, promoting layer interpenetration and optimal donor content.
- Achieved a highly crystalline fibrous structure, enhancing hole mobility and suppressing non-radiative recombination.
- Demonstrated improved device efficiency (19.75% for 100 nm D18/eC9) and operational stability (90% retention after 270 h).
- Exceeded 20% efficiency in multiple systems using 2PACZ as the hole transport layer.
- HS-processed 300 nm binary devices achieved over 18.12% efficiency.
Conclusions:
- Hot-substrate processing is an effective strategy for optimizing organic solar cell active layers.
- The technique enhances morphological control, leading to improved photovoltaic performance and stability.
- This approach offers a pathway to achieving higher efficiencies in organic solar cells, including thicker active layers.
